handle apache DocumentRoot cyrillic encoding

When DocumentRoot contains cyrillic characters like

DocumentRoot /home/hans/web/cyrillicрф.ratma.net/public_html

and PHP is invoked with SetHandler (*PS not applicable to ProxySetMatch, the problem occurs with SetHandler specifically) like

    DocumentRoot /home/hans/web/cyrillicрф.ratma.net/public_html
    <FilesMatch \.php$>
        SetHandler "proxy:unix:/run/php/php8.3-fpm-cyrillicрф.ratma.net.sock"
    </FilesMatch>

then apache will url-encode the cyrillic characters before sending it to fpm, so env_script_filename will contain

/home/hans/web/cyrillic%D1%80%D1%84.ratma.net/public_html/index.php

and we need to url-decode it to 
/home/hans/web/cyrillicрф.ratma.net/public_html/index.php

otherwise we hit that 
					zlog(ZLOG_DEBUG, "Primary script unknown");
					SG(sapi_headers).http_response_code = 404;
					PUTS("File not found.\n");

error code path.

Author: divinity76

sapi/fpm/fpm/fpm_main.c

@@ -1035,8 +1035,17 @@ static void init_request_info(void)
 				/* Copy path portion in place to avoid memory leak.  Note
 				 * that this also affects what script_path_translated points
 				 * to. */
-				memmove(env_script_filename, p, strlen(p) + 1);
+				size_t plen = strlen(p);
+				memmove(env_script_filename, p, plen + 1);
 				apache_was_here = 1;
+				// If DocumentRoot contains cyrillic characters and PHP is invoked with SetHandler (not applicable to ProxySetMatch),
+				// then the cyrillic characters are urlencoded by apache, and we need to decode them, for example with
+				// DocumentRoot /home/hans/web/cyrillicрф.ratma.net/public_html
+				// env_script_filename contains /home/hans/web/cyrillic%D1%80%D1%84.ratma.net/public_html/index.php.
+				// and we must decode it to /home/hans/web/cyrillicрф.ratma.net/public_html/index.php.
+				if(memchr(env_script_filename, '%', plen) != NULL){
+					plen = php_url_decode(env_script_filename, plen);
+				}
 			}
 			/* ignore query string if sent by Apache (RewriteRule) */
 			p = strchr(env_script_filename, '?');